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Model 641B Air Velocity Transmitter
Brand: Dwyer Instruments, LLCThe Model 641B Air Velocity Transmitter uses a heated mass flow sensor suitable for dirty air flow applications.
A Low-Cost, Direct Reading Instrument Used for Both Air Velocity & Static Pressure Tests.
It has user-selectable ranges from 250 FPM (1.25 MPS) to 2000 FPM (10 MPS).
Features- SS Sensor Suitable for Dirty Air Flow Measurement
- Ranges from 250 FPM (1.25 MPS) to 2,000 FPM (10 MPS)
- 4 to 20 mA Output
- Digital Filter for Signal Damping
Specifications
Accuracy
- 5 % of Full Scale Process Gas: 0° to 50° C (32° to 122° F)
- 6 % Full Process Gas: -40° to 0° C & 50° to 80° C (-40° to 32° F & 122° to 176° F)
Ambient Temperature Range
- 0° to 60° C (32° to 140° F)
Consumption
- 300 mA - Max.
Electrical Connectors
- Screw Terminal
Environmental Protection
- IP66
- NEMA 4X
Loop Resistance
- 600 ohms, Max.
Media
- Compatible Air
- Non-Combustible Gases
NPT Connection
- 1/2” NPT Female
- 1/2” NPT Male
Output
- 4-20 mA Isolated 24 V Source, 3 or 4-Wire Connection
Power Requirement
- 10-16 Vac
- 12-35 Vdc
Process Temperature
- -40° to 80° C (-40° to 176° F)
Response Time
- 0.5 to 15 seconds
- 1.5 seconds to 95 % of Final Value
- Exhaust stack flow monitoring
- Air control in drying processes
- HVAC air velocity measurements
- Fan supply and exhaust tracking
- Clean room ventilation monitoring